Mitigating Wrong-Way Driving Crashes - ITE Western District · Mitigating Wrong-Way Driving...
Transcript of Mitigating Wrong-Way Driving Crashes - ITE Western District · Mitigating Wrong-Way Driving...
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Mitigating Wrong-Way Driving Crashes
Melisa D. Finley, P.E.Research Engineer
ITE Keystone Joint Western and Texas District MeetingJune 25, 2018
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Background
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What is Wrong-Way Driving (WWD)?An event where a driver, inadvertently or deliberately,
drives in the opposite direction.
John DoeTxDOT
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Texas WWD Crashes on Freeways*
237 crashes/year< 1% of all crashes
12% result in a fatality
47% result in injuries
* CRIS data from 2010 to 2014
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Texas WWD Crashes by Time of Day*
* 1409 crashes on Texas freeways from 2007 to 2011
AverageBAC level0.18 g/dL
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More Wrong-Way Events than Crashes
Avg. 33 Crashes/year*Avg. 447 Events/year**
* CRIS data from 2010 to 2014** SAPD data from 2011 to 2015
TxDOT
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What Can We Do?
•There is not ONE answer!•It takes engineering, education, and enforcement•Variety of countermeasures needed•Need capability to detect, monitor, and warn•Connected vehicles (CVs) provide anew approach
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TxDOT Project 0-6769September 2012 – August 2014
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Alcohol-Impaired Driver Study
•Conducted at night on a closed-course•Phase 1 study •Determined where alcohol-impaired drivers look •Determined impact of alcohol on• Sign color recognition• Sign legibility distance
•Phase 2 study•Assessed conspicuity of selectWWD countermeasures
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Where Do Alcohol-Impaired Drivers Look?
•Look more at pavement in front of vehicle•Concentrate glances in a smaller area
BAC = 0.00 BAC = 0.12
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At Higher BAC Levels…
•Must be closer to sign to• Identify background color•Read legend
•Drivers misidentified red background color as orange•Took longer to find signs and arrow pavement markings
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WRONG WAY Sign with Flashing Lights
•San Antonio 15-mile pilot corridor•Increase conspicuity of signs at night•Lights continually flashedunder low ambient lighting•Catch attention on frontageroad prior to entering freeway
After Analysis Period Reduction in WWD Events22 months 38% 46 months 32%
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Warning Message for DMS
•WARNING•Conveys urgency•Distinguishes fromtraffic safety messages
•WRONG WAY DRIVER•Do not split phrase onto two lines•Location implied•Non-specific driving action implied
•REPORTED•Validation that ongoing event
WARNINGWRONG WAY DRIVER
REPORTED
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TxDOT Project 0-6867Phase 1: February 2015 – December 2015Phase 2: April 2016 – October 2017
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Key CV WWD System Features
•Reduce the time from detection to alerting right way drivers and law enforcement•Ability to provide warning messagein-vehicle in addition to broadcasting to DMS
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CV WWD Project Overview
•Phase 1•Reviewed state of the practice• Identified user needs•Developed concept of operations, functional requirements, and high-level design
•Phase 2•Built and tested a proof-of-concept system•Conducted human factors studies
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TxDOT CV System Architecture
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Types of In-Vehicle Messages
Wrong-Way Warning Message Alert Message to Right-Way Vehicle
Alert Message to Law Enforcement
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NCHRP Project 03-117 May 2015 – January 2018
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Overview
•High-speed divided highway safety analysis•Examine characteristics of wrong-way crashes•Determine impact of median width and select traffic control devices
•Active technology evaluations atfreeway exit ramps•LED border illuminated signs•Red rectangular flashing beacons
•Recommended changes to MUTCD
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Final Remarks
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Acknowledgements
•Texas Department of Transportation (TxDOT)•Southwest Research Institute (SwRI)•Texas A&M Transportation Institute (TTI)
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Contact & Report Information
•Melisa D. Finley, P.E.TTI Research [email protected]
•Reports•TxDOT
• http://tti.tamu.edu/documents/0-6769-1.pdf• http://tti.tamu.edu/documents/0-6867-1.pdf• http://tti.tamu.edu/documents/0-6867-01-1.pdf
•NCHRP final report should be published inthird quarter of 2018 (July-September)